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In a grid-connected PV system using a QZSI(Quasi Z-Source Inverter), the capacitor voltage of an impedance network is controlled to be constant to track the MPP(Maximum Power Point) of a PV array and generate the reference output current. For higher efficiency of the system, if possible, the reference voltage of the capacitor should be set at a lower value. On the other hand, the reference voltage...
This paper presents the MPPT (maximum power point tracking) and PCC (point of common coupling) current control strategy for grid-connected PV system using the ZSI (Z-source inverter). Several requirements of an inverter for PV-system and the shoot-through effect of the ZSI are analyzed. And then, the MPPT algorithm and PWM method for the ZSI are suggested. The feasibility is studied through the simulation...
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